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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0456a3391fba4ddb75956a7195eda0d0c5bc874232b1724b472fc14d62d5b4ef' 
  AND token = 'mg7BLhaHQMjs9U67MmuTIfhVcFdr3E7U4rl3/yJXFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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