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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a88761dd35dbabed82d96f8fc25a8ee46d2187b7acf9348b220f1ab1aca368' 
  AND token = 'nXSoMtW4vJYjyPc8DJfocmX+nESA0Dkkv4l85mDQ+t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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