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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf133421944abf33aeacd0963653ff34712fda3cc43069b0495d35e4f609b44' 
  AND token = 'pw6Dd2/FMO83LFjS5qwVW4kk1C8eWqqFEBOgRFs/hTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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