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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dba9ee8f15a3d92306c1a7388d88de382e8b4db0025b6d0cf47f8c2c641c21' 
  AND token = 'ClNhpf1Y9QviDLanJ/infXJlFXLBFyhYrH+9eu7Td2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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