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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b51ef431b302397acf9aaffe0218d99c1c2cfd5f5ea0f387f0091f8e5388cf6' 
  AND token = '/hfru38FZ+yQ84jukfIuHDzsn9Bv2D0X91iK4yQhQ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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