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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcabceca3186ff164a2bc6a549da7fb51cd3b0d94fe3411c157c0854086070d9' 
  AND token = '+KHbaevSoNqaTKkUk7g5BdkGIfwwqC68t8Bf7zqmhQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}