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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0bf9efb87bdeec0c6f3dccea28068bb28d4351ad687e61611a1532f3a9ac4b' 
  AND token = 'e1ou50Dau4ayhbf28h8D4Tpk/EMme7gDPwL1ihjTWio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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