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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4e011b269a00c806d080a894b26fd52c3952d3a58509fc9f8b836004228409' 
  AND token = 'MtJ6DVqFslYvJqGEfkHjJKYdEWypMW0NhVnA4jS8D6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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