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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c6023b8b93241b6bfd119f270df342a1c89e874d8f60472d265a0d6977f96a' 
  AND token = 'N2MvjeaAG9PUfIM/9tUaHU25kRmGCyMNH4UKp27/TSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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