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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47a9f61a7c09fefbfe653c2aca26d68bd159604607e84ea08d82dbf89d489fc' 
  AND token = 'iPSoDD9jGPrRPk1YWiVumpcu1FV+9HmzjdGqS71J3WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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