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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f64b6013387ad43793891e4924cc6e57cd8334b8c234ec8e503757a4f1a2b' 
  AND token = 'i526f9KNTyHXt/33qsQJXpEe6HxeUUZaEQuaTRu82JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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