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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81696e517e5b5fd20ad33e639d4d18e39634241b95dd1237fc20d41d097fc5e' 
  AND token = 'vj8kh1VHpIwMOR1y3xYMRk1u7iEg4As8sPNi6zbWpcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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