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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46482e25ba7c2c66d9e0b0b60d916ddaaa44096d2d6646a2089360d0abf0ff12' 
  AND token = 'xwbKH4HGIQ4Km/qqfNfMUjmkP8UgQHNZKSkWK1j6aBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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