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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343a44748b4bd2cf95f00e2e56eb577c1b71b21aadf38dd4bdab54994895258f' 
  AND token = '0cdWERcBzxnROFzf+EpHKV9Z9dlD0kUrKzVR/6kwEnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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