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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95eed591ffe8de346fedc4c2eb6f9663395862c43555d387a0e7711fe317ecf9' 
  AND token = '70Lrs3n8tYGVc9Or7qHPcpz7RDWDeJhECf1x24qIdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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