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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc842a9c9578cb9083346305958f717851e53752cf1d2083dac0d210f34574a8' 
  AND token = '5RKmZQfn6y8AyKPyElU3pU8NNWQW4FslXapYTBEK/No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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