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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca50685123d14563ab55ae88b6343559dcfed39a9685aca4c4f69065b30dffac' 
  AND token = '3WKt80vYmPbkrlGgE3e9lvh9syj/2XLnKjzuUReZC+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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