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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4aef9e95af9dbb017c8f6c2e8a556e85ecf1bb600321d6e7aa9a3c2c60134a' 
  AND token = 'JPL+8UYXQrvDR8GORk3GfKU0aa1nOlCAu24HVYm63OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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