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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a81ffc1b2690ffe48dc5e325d9e88251ffb200730dae529d8b57aac5453a143' 
  AND token = 'Lvf5nH4f6bjrWGufb4uRUXi1wJJb8FLYIGnO2waaeCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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