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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cbe9c5339f5f75bc8480668bb59468a4138bac8bad75c4740a135906bc30f9' 
  AND token = 'qvB5AOItLQmaaUNyfK0jJy2HucRHfsU+4wCgozy1GUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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