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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555c47b4821aba4dea26d411d661be19663f20de719b8efd617e7864c8d4b14b' 
  AND token = 'HnVTpuTWocTOP2lFuuxXwEIkzK6oiBvS8LAnSG2CJ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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