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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9bda494811f83acfafa59a976d304c08c07190950acc69433a0ffbad5eddf5' 
  AND token = 'oPmOrJEvIgP7Wm2i+I+Rh54Uyf4wC4jJCS+LDaUSOBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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