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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4eb990a2f00c8ea19ffbff9f9258938d215fa8a141209fdb7a892b343f3f9f' 
  AND token = 'WGOfJN3V2VqJCe609jmGcaUlzpgKDazwUn4BlMhPTq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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