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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796cf6ff7821a67e810899dccd14dcc8e3bb8d135a117d21fd4ddbd5ac23222' 
  AND token = 'teVH0Kv5M3KZEQw8l5ls8lm5hYfFpbQhxLUEZhqMuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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