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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc30d4a46e7a4f2047f16f98c8aabaa25c67c36d1a0683d210cd5cc24df2046' 
  AND token = 'aXFJZ7FScVrs5VLPvkf/6RlCcHfKpUbmINwPRA0JAZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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