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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9a650b1b17ea6227d60614c13d40d18c030f559584a384faccf12082e7818c' 
  AND token = 'M56uiEnWweYaNPkk04zliOZM90prDgs91y1cXjp5Nx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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