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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ddaacc96e3e1224339824727aad3d3a84832cbc416ab6b67d8654d52270a16' 
  AND token = 'bmmul6jalyA5hgz6nai/8NKz5y18F0rpluIhk/d9cCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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