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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5214d89fa04e7ca08b5549b95a1614c70648da4ed895717e77f91158dfb3a39b' 
  AND token = 'sexUMPWW4pw6uicOD8ewtJ3wBWK/4YeT8QZthd5U3AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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