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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4836aab41d8d6f0b2ccbb76b156c7fc5155e80655384c47aadcdf9fda1e7d0c4' 
  AND token = 'KJJ86XEjACK4wDy/c/M8ZN8BYuabLI1m+VDlaKibGOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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