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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64d5a6ba9eab8e7142b4324c051ec1a69618efe4c8ba6557ddf3f06976f3fe3' 
  AND token = 'jbMdYB8ARDfL6cvEvfZMmknKcL03LM/dDQW38X5IGZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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