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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1150ba8af62b45b26c30f43601319247cca338da84dc6e6b78026327d456f988' 
  AND token = '8FQaInxVazqvCtO0LP6fquauMzR66UWRVNo8TXIG31w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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