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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1752d7ece56d1bbde01ae722a5b75364e39045ad29192fc3fe87d077e760e58' 
  AND token = 'SCsrWE8bBNSedwUmq8x9kqa06oSb0Uw9Nbd6UI1L/Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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