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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c8c28acc7a30d64a29a5a07cf0d7531f0eea17344214945261511bf8e373fb' 
  AND token = 'w+MBC0Xjljebee0RakUl4Rsg2bngxB9UuGIVhErKc6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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