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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3c98d14d0b7ad7c578f1bd8a38fb6d1a38a4ec934866c7c224a881c0220653' 
  AND token = 'NJ4osoHgI20uscHC2isxLRy9yv7JYmJ0RRCxMliaiOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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