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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f31a75369e3443a4cbf16815d04d2630aa16769479775e533376612cd7acf3' 
  AND token = 'Anu3eBfphNR8rGkB97aacY5S9j/S3ua6DspT7OMN+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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