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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e618373dc07e8d8884ad74a9424377a1943b4f400b95eda680e8935c3d9405e' 
  AND token = 'mAp3G7JBHtFAf0sfLEQJ2xSj8mqNU54T2MtGL5cQd1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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