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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f53ff3cface5e0f86b6b267544a80ec6da98cc2d4ec50c7b02b22240c7c438' 
  AND token = 'U0Q0vsKWzYWKNEn9/p3/WdV9fh/mwHXwtwjJOVNsQ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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