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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80fb71b5ebe89155b11ee74859ebfc6a840f322dc032ec7d0ffb55304550bb8b' 
  AND token = 'vsjSBpg9996ymz1oH5gOz5MVKy3auWv8SCQM+f9BF8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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