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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dea44b9c54eec348fa6e8d4326cbc6fa11e0cc9c2d3a1254d23f51c5bf8600' 
  AND token = 'RNharoi0yyrlekinsSxojWywq62d7JdmoPuUpDa/h+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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