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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb5888139fdcb35ae4b37bfac62d95713ae27311d41d12fab5e998f39e2bd45' 
  AND token = 'W3utnz0eOCY2MH0Ibc4UvLkm9LxKX9HP1+6IVeoKKPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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