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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3dfca1a166fa3e9a8cdd6a05d87a5b1294efc0c16a3dfd440bb353b9aa4f5f' 
  AND token = 'Vnc5ZqPcBCSqSDHuMnrtyW1MzgzN4K53VPSAL5gpVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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