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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf821640fd15c9cd1b73792d71114cbf47ee023ef7c9728ff755a0feb177071a' 
  AND token = 'kd3iBiE4LNa3WJNT4rLkYIC+6XmlkmkDErkEkWv4GIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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