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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a5815864f7efaf34ef2ef6da7ee1f597ae7b8206979e0db1887147be53ac46' 
  AND token = '1uAcrzQ+1PwuDqNpx9QvWgWYeCJa6eRlI2W/Er/JnFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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