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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf03346d169addcc85755fc678e3cd60f2895ec2ca6445c39717a23380483878' 
  AND token = 'blcdrzjhPy0ff7v9lxuxL3yNx6Aj2Ch+04lCI2Qcmtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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