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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7231298e42f27a41e520ca4177b411406ae0003dc86f8a393bb421f42a3d02bd' 
  AND token = 'rp7MVRYxGbtpVuHdrinmR6gocBlnYkeFjvZyy38LdGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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