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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4f62bc4c7ff73a5af30fcba2f750bcb2c67eb6206d548a06a4f705fa560563' 
  AND token = 'scMSUYcGE4N0ouRtmZBGPnz0+BwGendAv4jPsfG6wuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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