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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868fb6ff024f3ae5ee9d017a092631f5a9af2a1a6dc14abd2dc9d5d7854e5c07' 
  AND token = '7MvT77JXqHyHQg5lV1vjxeWTwslNwNJ/9N10jJdDqis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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