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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e525ec8621c8b7f8618fd3ce39f57010b2c90a8c8bb2fc73fb2b76bf971d84d9' 
  AND token = 'Wzuy4Iy4pLkEHGcAk2wOYVllZW8kMWmhFt9m1g4dbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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