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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1faccfd2007466f5b1a00e97bbf90a7c19e4b89ea58c4036da8506f5922ce6' 
  AND token = '/W6EvH9O6UTkn4yhwkysJkqJpU6nHlLr/hx0zyjRpqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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