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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093496146f6e562b5442586b94eea5d3ba0eb901cb1fdc8af9810b5b26390b8c' 
  AND token = 'lY4DfEYfbI2OKbBCYRQGdRi7vkco9wa3FsuRQUth1gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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