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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd386369c0e00c2dddef220b0f9dcfa48e6bff93ffa30211e9ab56f41eb2cda00' 
  AND token = 'VUjDN8tS9lfaDmqdSaErmBzu75Y1SX7Yc1QboqFKxhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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