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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ea1863f093d095a1b92dc6ae4f7796ff98bb52cf727793753a3a1ea2eefbe7' 
  AND token = 'zoRBVVb+EoLjtTXTWGy4ukq5deWdLhTGHpTMOVOwHOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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