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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb5e2831a7c6df4008223daf5d49c997f4985a2f34f9fb479757c1ab2440dc6' 
  AND token = 'EtQdtt+EmwreeKsaIqeSOkSHyiW8IngqZx2Y5ZJFeAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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