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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5001a7be9de622206e3d6d694301e2db848f4fe4a93194af10502423930725' 
  AND token = '6wbeZ62v4D9cvt5vxaO47mfr2NhmBIWQuw+GI8lt1M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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