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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091227411bf94d1478bd07603910186a73e050751e8ce196eefa4e17470a580f' 
  AND token = 'erjGIED/YNtM6P6jkLG0xJOsV6BxOKq4uxjMGKiTm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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