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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcd8b1cf6624321c024bbc6f97179bbef50ad0f6ed9d6acdb471e816aead411' 
  AND token = 'aVwp/HxOiTopWp1D9j3085KfQOSVKDRcdqDNWenOQeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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