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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4959bf3ec39f317ebcbf9930c3e1bf4506d5a4fe3611932c543671f36e3604b' 
  AND token = 'eyOccgDZRtpLGzyU2sFCKiZ4j6DisUdEjYK+fWgh+AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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