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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5590a1bbdcbf42cba251fa47a22519b2d902fda531d2c15668fa4369b39e9d07' 
  AND token = '8bPYtNPYjhQfYtbyLEiOBwhW0BNjh8mFxdRYpGl4Hjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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