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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4061ac6a1bcb89f5ba510e45ff41102ec52ba1de52a6067f242232fa3b089501' 
  AND token = 'RIm7cqBNSK9p84/Vpd4Uxp/xIXOfeY0IVh8CnpkiCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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