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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc986fb17b78592f2bc0f3ae73835e31e1045c1932e00a038b4ae48eea2e8b07' 
  AND token = 'Nr83vt6rWsm3Z2tZfMEFk+NNr7HJsne1vmuo1vryOE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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