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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e309db0b3bef04fa84c7088e9d469ceab2892ce6908c1e515404cb59b6f1fbe5' 
  AND token = '6L6CzmDFTJAS+UFFddpHS4EeAd+Oy3JzHkT2wiVqOag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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