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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d629d0e2d3d6773a961b7750281439f3e29798d05b845a59c2c02d8e6b2473' 
  AND token = 'rndB4nShLA7/4XaVktRgdENWbXkS+8ecD7njzD2M+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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