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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bf48c2954258590e16be1ef15403a9451293384b66d41813f15f00f2289404' 
  AND token = 'bfjKxdxd9TX58lZHvHW0FcuLLHGO3n/ar72Id/dJbGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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