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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed191a0e8287157c219bb459d9d2c17a1a809a2f90ef6728378939629f5d8535' 
  AND token = 'obQlBnd3AJ+s3zexroeFrkUp32tmzdJDVOo9nUfpLvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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