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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ec6926400f8de3744d8ef0f44a67366c7f964cccfe1af70d840889fbe72f2f' 
  AND token = '4uaQDi5g4R6qoE3P8Brb9ZxuXeRAhSK9j0qU/Wzw7iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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